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Subject: Re: Silicon Sea: Leg 82 Q4
From: Paul Hirose (paulhirose@XXX.XXX)
Date: Sat Dec 08 2001 - 16:20:52 EST
I like the new problem format with the answers at the bottom. This is
much nicer than waiting for "teacher" to post them. And if you goof
you catch it right away. Yes, the real world isn't like that, but in
the real world you're also more motivated to work the problems!
> The sky has been overcast for days. we have been unable to get a sight.
> Var 10.0dE Dev 1.0dE. Speed 10.4 Kts.
...
> 4) What is the Speed Made Good(SMG) to this DR?
> What is the Compass Course(CCMG) this DR?
I don't understand why the correct answer is 10.8 kt, not 11.1. The
speed used for the DR (which does not include current) is 10.4. The
current is .7 kt flowing toward 285. That's just 6 deg off our course,
so for practical purposes it should add directly to our speed thru
water, shouldn't it?
Also, why isn't the correct answer for CCMG identical to the compass
course we're been steering?
The part I clipped out is the sun line at 2010Z, but it should have
nothing to do with the DR. It's crossed with another sun line for a
running fix later.
--paulhirose@XXX.XXX (Paul Hirose)
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